Update UserGuide

[ZD292]

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[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (4fbceae) 60.49% compared to head (1cc11d5) 62.82%.
Report is 7 commits behind head on Branch-v1.4.

Additional details and impacted files

@@                Coverage Diff                @@
##             Branch-v1.4     #262      +/-   ##
=================================================
+ Coverage          60.49%   62.82%   +2.32%     
- Complexity           642      668      +26     
=================================================
  Files                116      116              
  Lines               2458     2456       -2     
  Branches             278      279       +1     
=================================================
+ Hits                1487     1543      +56     
+ Misses               863      803      -60     
- Partials             108      110       +2     

Files	Coverage Δ
...address/logic/parser/GroupPersonCommandParser.java	71.42% <ø> (+71.42%)	⬆️
...rc/main/java/seedu/address/model/ModelManager.java	52.45% <ø> (+13.93%)	⬆️
...main/java/seedu/address/model/group/GroupList.java	72.34% <ø> (+8.34%)	⬆️
...edu/address/logic/commands/GroupPersonCommand.java	59.09% <0.00%> (+59.09%)	⬆️

... and 5 files with indirect coverage changes

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